One of our most important objectives in seeking a universally ratified Law of the Sea Convention is to put a stop to the erosion of high seas freedoms in coastal areas that characterized the development of customary international law in the twentieth century. There is no reason to believe this erosion will not continue in the absence of a treaty restraint. In my opinion, the most plausible way to block the gradual erosion of high seas freedoms in the exclusive economic zone, and its eventual transformation into something much more like a territorial sea, is a widely ratified Law of the Sea Convention to which the United States is party, and with respect to which the voice and practice of the United States are prominent authoritative evidence of what the Convention means.

For operational planners, the essential question is not what we think our rights are, but what foreign governments think. We need the greatest possible influence over the perception of foreign governments regarding the source, legitimacy, and content of their obligations to respect our high seas freedoms, especially in their exclusive economic zones. We achieve that best by becoming party to the Convention. The alternatives are likely to be both less effective and more costly.

The United States might react to these coastal state navigational restrictions in four possible ways.³² First, it could acquiesce in them, a reaction that would significantly restrict navigational freedoms important to the United States. Second, the United States could continue to assert, via diplomatic channels, a customary international law right to navigation, backing up its assertions with naval exercises. Although the United States has been following this practice since 1979 under its Freedom of Navigation Program, this option is expensive. It is expensive in terms of dollars, potential confrontations, and prejudice to other U.S. interests in the coastal state.³³ Furthermore, this option may not contribute to a stable legal regime, since some U.S. claims under customary international law could compete with coastal state assertions of different emerging rules of customary international law. Third, the United States could negotiate bilateral treaties to preserve U.S. navigational rights in other states' coastal zones. This option is also expensive. Small states, not interested in sailing their vessels or conducting military exercises in U.S. waters, would expect other new military, economic, or political concessions in exchange for allowing the United States to conduct military exercises or navigate in their coastal zones. Finally, the United States could accept the multilateral Law of the Sea Convention. With respect to navigation rights, this treaty provides a stable legal base from which to promote freedom of navigation rules. Its written and hard-to- change rules, though not always highly determinate, at least narrow the range of disputes over permissible and impermissible restrictions on navigation. Convention proponents have strong consequentialist arguments to support the position that the Con- vention's freedom of navigation provisions benefit the United States.

Why support the Convention now? Administration officials cite a "resurgence of creeping jurisdiction" by coastal states within their EEZs.³⁶ This resurgence threatens Convention-based navigational rights, which are at least as important today as they were during the Cold War. Alternative ways to respond to creeping coastal state jurisdiction are not satisfactory. If the U.S. continues to rely on assertions that customary international law establishes certain navigational rights, coastal states may increasingly counterclaim that emerging customary international law restricts such rights in coastal zones.³⁷ Some coastal states may altogether deny that Convention-based navigational rights exist under customary international law. As Admiral Michael G. Mullen, Vice Chief of Naval Operations, testified before the Senate Foreign Relations Commit- tee, "some coastal states contend that the navigational and over- flight rights contained in the Convention are available only to those states that also accept the responsibilities set forth in the Convention by becoming parties to it."³⁸ if it joined the Convention, the U.S. would likely have less need to rely on either its Freedom of Navigation Program³⁹ or negotiating new bilateral agreements.⁴⁰ The rules in the Convention clarify issues and narrow considerably the range of possible disagreements over navigational rights. Accepting the Convention will thus be less expensive-in terms of dollars, potential confrontations or loss of good will with coastal states, and U.S. concessions on other fronts-than continuing to stand outside it.